Tomohiko Taniguchi and Mark
Johnson, Speech
coding and decoding system (transform stochastic codebook so that,
after perceptual weighting, it will be orthogonal to the adaptive
codebook), U.S. Patent 5799131, August 25, 1998 (Fujitsu).

Mark A. Hasegawa-Johnson, "Burst spectral measures and formant
frequencies can be used to accurately discriminate stop place of
articulation," JASA, 98:2890, 1995
(a href="http://mickey.ifp.illinois.edu/speechWiki/index.php/TIMIT">Comments on the data